Network diagnostic guides
Read the evidence, choose the next check, then compare a fresh run.
Using and interpreting this tool
Confirm the target and measurement point, then start the checks you need. Results retain sources, observation times and missing-data reasons. Traffic-intensive checks require a separate start.
After changing one setting, start a fresh run and compare A/B snapshots in history. Unknown, unconfigured and inapplicable do not mean passed.
Related tools and guides
- Methods and evidence limits
- What IP quality can tell you
- Why IP databases disagree
- Investigating WebRTC and IPv6 bypass
- Why AI streams can stop
- Troubleshooting an unreachable website
- Reading domain, certificate and regional results
- Disconnect drills and long-term monitoring limits
- Observed cases and acceptance records